Do your students need practice with estimation? In this themed deck, will use rounding to estimate the difference of 2-digit numbers. To play, students will round each number to the nearest tens, then calculate the difference. Students must type their answers into the boxes provided. The great thing about Boom Cards is that the students will receive immediate feedback after each card. Digital Self-Checking Boom Task Cards do not require any printing, laminating, or cutting!!! Use these cards